TY  - JOUR
AU  - Vaserstein, L. N.
TI  - On normal subgroups of $\mathrm {GL}_2$ over rings with many units
JO  - Compositio Mathematica
PY  - 1990
SP  - 157
EP  - 164
VL  - 74
IS  - 2
PB  - Kluwer Academic Publishers
UR  - http://archive.numdam.org/item/CM_1990__74_2_157_0/
LA  - en
ID  - CM_1990__74_2_157_0
ER  -